Perovskite Blocking Layers for X-ray Imaging Dark Current Reduction
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Solution Overview
Problem
Current photoelectric conversion devices face challenges in achieving high efficiency and reducing dark current due to limitations in electron and hole blocking layers, particularly when using perovskite compounds in imaging devices.
Innovation Solution
A photoelectric conversion device is designed with a first perovskite compound in an electron blocking layer and a second perovskite compound in a hole blocking layer, both potentially combined with polar polymers, to enhance electron and hole blocking capabilities, thereby improving photoelectric conversion efficiency and reducing dark current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electron and hole blocking layers are used in photoelectric conversion devices, then device structure is simple, but photoelectric conversion efficiency is low and dark current is high
Solution Approach 1:
The patent employs composite material strategy by combining perovskite compounds with polar polymers in the blocking layers. The electron blocking layer comprises a first perovskite compound and a first polar polymer, while the hole blocking layer comprises a second perovskite compound and a second polar polymer. This composite structure leverages the high charge blocking capability of perovskite materials and the adhesion benefits of polar polymers, achieving superior photoelectric conversion efficiency and dark current reduction compared to conventional single-material blocking layers.
2Object-generated harmful factors
If perovskite compounds are used in blocking layers to reduce dark current, then dark current is reduced, but adhesion between layers may be insufficient
Solution Approach 1:
The patent addresses the adhesion issue by creating composite blocking layers that integrate perovskite compounds with polar polymers. The polar polymers provide strong interfacial adhesion to adjacent layers while the perovskite compounds maintain high charge blocking performance. This synergistic composite structure simultaneously achieves dark current reduction and improved layer adhesion, resolving the contradiction between these two properties.
Solution Approach 2:
The patent applies local quality principle by assigning different functional roles to different components within the blocking layers. The perovskite compounds are positioned to provide charge blocking functionality, while the polar polymers are incorporated to provide adhesion and structural stability. This spatial and functional differentiation within the composite layers allows each material to optimize its specific function, achieving both dark current reduction and strong adhesion.
3Object-generated harmful factors
If perovskite compounds are used in both electron and hole blocking layers, then charge blocking capability is enhanced, but material selection and manufacturing complexity increase
Solution Approach 1:
The patent implements local quality by differentiating the composition of electron and hole blocking layers. The electron blocking layer uses a first perovskite compound optimized for electron blocking, while the hole blocking layer uses a second perovskite compound optimized for hole blocking. Each layer's material composition is locally optimized for its specific charge blocking function, enhancing overall charge blocking capability while maintaining manufacturing feasibility through specialized material selection for each functional region.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed configuration significantly enhances photoelectric conversion efficiency by reducing dark current and improving adhesion, leading to improved performance in imaging devices, especially when used in X-ray imaging applications.
Implementation Method 1
A photoelectric conversion device refers to a device which converts an optical signal to an electrical signal. A photoelectric conversion device may use photoelectric effects, for example, a photoconductive effect and a photovoltaic effect for converting an optical signal to an electrical signal.
Data Source
AI summary
A photoelectric conversion device including a perovskite compound, a method of manufacturing the same and an imaging device including the same.